47
network
Low grid voltage
Check the voltage of grid connection point by shutdown
Inverse Voltage Sequence of
Power Grid
Disconnect the power supply switch and Turn off to check the three-
phase wiring
Abnormal
Frequency
of
Power Grid
Turn off and check grid voltage
DC Contactor Fault
Turn off and check whether the DC contactor is damaged.
Fault Type
Processing Method
Output
contactor
open
circuit
Turn off and check if AC contactor is damaged
Output
Contactor
Short
Circuit
Turn off and check if AC contactor is damaged
AC Fan Fault
Turn off and check AC fans
AC auxiliary power failure
Turn off and check the AC auxiliary power supply board
DC auxiliary power supply
failure
Turn off and check DC auxiliary power supply board
15V power failure
Turn off , check AC and DC auxiliary power supply board
Inverter overcurrent
Turn off , check whether the input and output of the inverter are short
circuit or whether the inverter is overloaded.
Wave by Wave Current
Limitation of Inverter
Turn off , check whether the input and output of the inverter are short
circuit or whether the inverter is overloaded.
Inverter Fault
Check operation before switching off repetitive inverter
Inverter overheating
Turn off , check whether the inverter fan is out of order and whether
the air duct is unobstructed.
Inverter Phase Shortage Fault Turn off and check AC side line
Inverter asynchronization
Turn off and check the inverter settings
Lightning protection failure
Turn off and check the lightning protection of the inverter
BMS Communication Fault
Turn off and check if the communication cable between inverter and
battery system is loose
Overload
Turn off and check load size
Isolated island protection
Turn off
